(a(i))[3]
State three key features used to classify an organism as a fish.
(a(ii))[2]
State two vertebrate groups other than fish.
(b(i))[2]
Define what is meant by the term species.
(b(ii))[1]
Give the species name of the organism in Fig. 2.1.
(c(i))[1]
Name the process responsible for the evolution of the muscle behind each eye in the swordfish.
(c(ii))[4]
Suggest why the evolution of this feature has helped swordfish survive in the ocean.